摘要
【目的】分析干旱区农田表层土壤重金属含量及土壤可能存在的生态风险。【方法】于乌鲁木齐米东区采集农田表层(0~20 cm)土壤,分析As、Cd、Cr、Hg、Pb、Cu、Zn、Ni 8种重金属含量,综合运用地累积指数法、潜在生态危害指数法评价米东区农田土壤生态风险,采用相关分析法和主成分分析法分析米东区土壤重金属的主要来源。【结果】米东区农田土壤8种重金属含量均低于《食用农产品产地环境质量评价标准》(HJ/T 332-2006)限值,Cd、Hg、Cu、Zn平均值高于新疆土壤背景值,Cd、Hg平均值含量为新疆土壤背景值的3~4倍。地累积指数(Igeo)平均值Hg>Pb>Cd>Zn>Cu>Ni>Cr>As,米东区农田土壤7种重金属整体处于轻度污染。潜在生态危害指数(RI)均值为31.41,米东区整体处于低潜在生态风险水平。米东区土壤Cr、Ni以自然源为主,Hg以人为源为主,Pb、Zn、As、Cd与Cu以自然、人为复合源为主。【结论】米东区农田土壤重金属整体处于轻度污染,低潜在生态风险水平,属于生产安全区域。
【Objective】Land quality and the safety of agricultural products are essentia-l for human health.The purpose of our study were to comprehensively reflect the actual pollution condition of the surface soil by heavy metals in arid areas and to reveal the pos-sible ecological risks of farmland soil in Midong area.【Method】In this study,sampled surface soil and analyzed the content of As,Cd,Cr,Hg,Pb,Cu,Zn and Ni,utilizeded the Geoaccumulation Index and the Potential ecological harm index method to evaluate the ecological risk in this region,correlation analysis and principal component analysis were used to explore the main sources of heavy metals in the soil of Midong region.【Result】The levels of 8 heavy metals in the farmlands of Midong area were lower than the limits of Farmland and Environmental Quality Evalluation Stands for Edible Agricultural Produc-ts(HJ/T 332-2006).The average values of Cd,Hg,Cu and Zn were all exceeded Xinjiang background values,and the mean contents of Cd and Hg were 3~4 times of the backgro-und values.The average Igeovalues were in the following order: Hg>Pb>Cd>Zn>Cu>Ni>Cr>As.The 7 heavy metal elements of Midong district were light pollution. The average value of ec-ological hazard index(RI)was 31.41,it evaluated that the midong district was all in low potential ecological risk.The main sources of Cr a-nd Ni in Midong regioon’s soil were natural sources,the main sources of Hg were anthrop-ogenic sources,and the main so-urces of Pb,Zn,As,Cd and Cu were natural and anthr-opogenic combined sources.【Conclusion】Heavy metals in farmland soils in the Midong a-rea were slightly polluted and had a low potential ecological risk,and it still belong to t-he production safety area.
作者
雷雷佳
殷新
贡璐
刘卫国
LEI Leijia;YIN Xin;GONG Lu;LIU Weiguo(College of Resourse and Environment Sciences,Xinjiang University,Urumqi 830046,China)
出处
《新疆农业科学》
CAS
CSCD
北大核心
2022年第9期2258-2266,共9页
Xinjiang Agricultural Sciences
基金
国家自然科学基金(31260112)
新疆联合基金项目(2017D01C058)。
关键词
农田土壤
重金属
生态风险评价
来源
farmland soil
heavy metal
ecological risk assess-ment
source
